Method for cloning genes
First Claim
1. A method for isolating and indentifying a recombinant clone having a DNA segment therein coding for at least one desired heterologous polypeptide, at least a short amino acid sequence of which is known, said method comprising the steps of:
- (a) effecting cDNA synthesis on a mixture of mRNAs containing a target mRNA coding for said at least one polypeptide, and isolating the resultant cDNA mixture;
(b) inserting said resultant cDNA into recombinant cloning vehicles, and transforming hosts with said vehicles; and
(c) separating the transformants and isolating and identifying a recombinant clone containing a DNA segment which is homologous over at least a portion thereof to at least one oligonucleotide probe specific for said DNA segment, said identification being effected by hydridization with said probe;
wherein said probe is an extension of the nucleotide sequence of an oligonucleotide primer having a nucleotide sequence complementary to a region of said target mRNA coding for a portion of said known amino acid sequence, said oligonucleotide probe being produced by separately effecting cDNA synthesis in the presence of said oligonucleotide primer and only three deoxynucleotide triphosphates, isolating and separating extended cDNA fractions having at least three more nucleotides than said primer, sequencing said extended fractions, and recovering at least one oligonucleotide complementary to a longer region of said target mRNA coding for a longer portion of said known amino acid sequence.
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Accused Products
Abstract
A method is provided for isolating and identifying a recombinant clone having a DNA segment therein coding for at least one desired heterologous polypeptide, at least a short amino acid sequence of which is known, by effecting cDNA synthesis on a mixture of mRNAs containing the mRNA coding for the desired polypeptide, isolating the resultant cDNA mixture, inserting the resultant cDNA into recombinant cloning vehicles, transforming hosts with the vehicles, separating the transformants and isolating and identifying a recombinant clone containing a DNA segment which is homologous over at least a portion thereof to at least one oligonucleotide probe specific for the DNA segment; wherein the probe is an extension of the nucleotide sequence of an oligonucleotide primer having a nucleotide sequence complementary to a region of the target mRNA coding for a portion of the known amino acid sequence, and is complementary to a longer region of the target mRNA coding for a longer portion of the known amino acid sequence. Recombinant clones coding for human histocompatibility antigens are provided, in particular, clones for HLA-B antigens.
252 Citations
12 Claims
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1. A method for isolating and indentifying a recombinant clone having a DNA segment therein coding for at least one desired heterologous polypeptide, at least a short amino acid sequence of which is known, said method comprising the steps of:
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(a) effecting cDNA synthesis on a mixture of mRNAs containing a target mRNA coding for said at least one polypeptide, and isolating the resultant cDNA mixture; (b) inserting said resultant cDNA into recombinant cloning vehicles, and transforming hosts with said vehicles; and (c) separating the transformants and isolating and identifying a recombinant clone containing a DNA segment which is homologous over at least a portion thereof to at least one oligonucleotide probe specific for said DNA segment, said identification being effected by hydridization with said probe;
wherein said probe is an extension of the nucleotide sequence of an oligonucleotide primer having a nucleotide sequence complementary to a region of said target mRNA coding for a portion of said known amino acid sequence, said oligonucleotide probe being produced by separately effecting cDNA synthesis in the presence of said oligonucleotide primer and only three deoxynucleotide triphosphates, isolating and separating extended cDNA fractions having at least three more nucleotides than said primer, sequencing said extended fractions, and recovering at least one oligonucleotide complementary to a longer region of said target mRNA coding for a longer portion of said known amino acid sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification